Patent GB-190511454-A (GB)
Title: Improvements in Means for Automatically Regulating the Load on Engines or Motors used for Driving Electric Current Generators.
Filed: 1905-05-31
Abstract: 11,454. Helios Elektricitõts Akt.-Ges. June 1, 1904, [date applied for under Patents Act, 1901]. Void. [Published under Patents Act, 1901]. Distributing; switches.-The load on a primemover A, e.g. an electromotor, driving the main generator D1 which works with a fluctuating load, is kept approximately constant by means of an auxiliary dynamo D2, connected in parallel with a battery B, and regulated by a system of electromagnetic switches. When the dynamo D1 is on a light load, the auxiliary dynamo acts as a generator to charge the battery B, while on heavy loads it acts as a motor to assist the prime-mover. In the continuous-current machine, generating an approximately-constant electromotive force shown, two electro-magnets M1, M3, energized by the dynamo D1 and battery B respectively, serve to attract a common armature H into engagement with one or other of two contacts K1, K2 arranged in the circuit of solenoids X, Y and batteries B1, B2 connected in series. A third electro-magnet M2, which locks the lever H when the current charging or discharged by the battery B is at its maximum, is wound with two coils, one of which t is in the armature circuit of the dynamo D2 and the other t<1> is connected on the one hand to an insulated U-shaped contact U on the armature H and on the other hand to the point of junction of the batteries B1, B2. Resistances W, R2, in connexion with the magnet coil M3 and the field of the dynamo D2 respectively, are controlled by the same lever Z. When the load upon the dynamo D1 is increased, the armature H is moved over to touch the contact K1, energizing the electro-magnet X, which acts by suitable means on the lever Z to reduce the resistance W and increase the resistance R2. The armature H is then moved back to its central position. If the load on the dynamo is further increased, the regulation is repeated until the current in the coil t of the solenoid M2 becomes zero and is finally reversed, the dynamo D2 then acting as a motor. When the current discharged by the battery has reached its maximum, the armature H is locked by the solenoid M2, and the coil t<1> is excited to assist the coil t by the engagement of an insulated contact k2 with the piece U, and simultaneously the armature H is displaced from the contact K1. If the load on the generator diminishes, the magnet M, moves the piece U into contact with k1, whereby the coil t<1> is excited to oppose the coil t, and the core is withdrawn by the spring F. The armature H thereupon moves into contact with K2, and energizes the magnet Y, which acts upon the lever Z to increase the resistance W and reduce the resistance R2. A further reduction of load causes the dynamo D2 to act as a generator, and the electro-magnet M2 again locks the armature H when the battery-charging current is at its maximum. If the dynamo D1 has to work with varying voltage or amperage or to generate alternating currents, the prime-mover is preferably an electromotor working with a constant potential difference at its terminals, the current used to drive the motor is also used to excite the magnet M1, the resistance W is dispensed with, and the magnet Ma is excited by a current of constant strength. The battery B may be used for lighting &c., if desired.